Equivalent & Substitute Parts for 93AA66/P

Part Overview

The 93AA66/P is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, utilizing Microwire serial interface protocol. This non-volatile memory device operates across a wide supply voltage range of 1.8V to 5.5V and is housed in an 8-PDIP through-hole package. The part maintains active product status with verified programmability through DiGi-Electronics.

Substitute parts are identified when electrical specifications, memory capacity, interface protocol, and physical packaging remain compatible within the allowed parameter tolerances for this memory IC category.

Substiute Parts

93AA66/P

Microchip TechnologyIn Stock: 194193AA66/P Datasheet

Current PartRFQ

93AA66C-I/P

Microchip TechnologyIn Stock: 182693AA66C-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93AA66/P is determined by the following criteria:

• Memory capacity must remain 4Kbit with identical organization (512 x 8, 256 x 16)
• Memory interface protocol must be Microwire
• Supply voltage range must encompass or match 1.8V ~ 5.5V
• Physical package must be 8-DIP (0.300", 7.62mm) through-hole configuration
• Mounting type must be through-hole

The 93AA66C-I/P meets all substitution criteria. Both parts share identical memory capacity, organization, interface protocol, supply voltage compatibility, and physical packaging specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the 93AA66/P and 93AA66C-I/P are active products from Microchip Technology with identical core memory specifications and physical packaging. Selection between these parts should be based on the following factors:

The 93AA66/P carries DiGi-Electronics verified programmability status and operates within a standard industrial temperature range of 0°C to 70°C.

The 93AA66C-I/P provides an extended operating temperature range of -40°C to 85°C, higher clock frequency (3 MHz versus 2 MHz), and faster write cycle time (6ms versus 10ms). This part achieves RoHS3 compliance and carries MSL rating of 1 (Unlimited), whereas the 93AA66/P is RoHS non-compliant.

Selection should prioritize application requirements for temperature range, write performance, and regulatory compliance status.

Frequently Asked Questions (FAQ)

Q: Can the 93AA66C-I/P directly replace the 93AA66/P in existing designs?

A: Yes. Both parts share identical memory capacity (4Kbit), organization (512 x 8, 256 x 16), Microwire interface protocol, supply voltage range (1.8V ~ 5.5V), and 8-DIP through-hole package specifications. The 93AA66C-I/P offers enhanced performance characteristics including higher clock frequency and faster write cycle time.

Q: What are the key differences between these parts?

A: The 93AA66C-I/P operates at 3 MHz clock frequency with 6ms write cycle time, compared to 2 MHz and 10ms for the 93AA66/P. The 93AA66C-I/P supports an extended temperature range (-40°C to 85°C) and achieves RoHS3 compliance. The 93AA66/P operates within 0°C to 70°C and is RoHS non-compliant.

Q: Are there any package or pinout differences?

A: No. Both parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging with the same physical dimensions and pin configuration.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. For extended temperature operation or RoHS compliance requirements, the 93AA66C-I/P is appropriate. For standard industrial temperature range applications without compliance constraints, either part is suitable based on availability and cost considerations.

Q: Is the higher clock frequency of the 93AA66C-I/P backward compatible?

A: Yes. The 93AA66C-I/P operates at 3 MHz, which is compatible with systems designed for the 2 MHz 93AA66/P, as the substitute part can operate at lower frequencies within system constraints.